446236 Tinymce remove-invalid-format-link

I've a website with TinyMCE. My users can copy-paste things into this editor with wrong format (spans, tables, wrong-font-families, MS-word-format, etc. etc.). The solution for me is a function thats cleanups all format, EXEPT allowed format: bold,italic,underline,strikethrough,forecolor,backcolor. I'm searching for a javascript function like this way: <form method="post" action="somepage"> <textarea name="content" style="width:100%"> </textarea> </form> <div> <a href="#" onclick="removeWrongFormat();return false;">[Remove wrong format]</a> </div>